LONDON - Nearly a third of all freshwater fish species are threatened by extinction, according to a new report released by 16 conservation groups on Tuesday."The World’s Forgotten Fishes" says that 80 freshwater species — which make up more than half of all the world’s species — have already been declared extinct, with 16 disappearing in 2020 alone.Conservation groups behind the report, including World Wide Fund for Nature (WWF) and Global Wildlife Conservation, point to a combination of pressures on global freshwater fish populations, including habitat degradation, damming and draining of rivers and wetlands, pollution, introduction of invasive species, wildlife...